stocks sell off on worries about japan. the dow fell 51 points, the nasdaq lost 14 and the s&p 500 was down seven. trading volume started the week with 962 million shares moving on the big board and 1.8 billion on the nasdaq. fed chairman ben bernanke meets with his interest rate committee tomorrow. topping its agenda? whether to change its $600 billion bond-buying program that's set to expire june 30. some members fear the bond buys could spur inflation when combined with rising prices for food, fuel and other commodities. but former fed staffer vince reinhart thinks the fed will stay the course. >> they probably won't do anything to touch any of the characterizations of policy, because they don't want market participants to get confused or think they're going to be rushing for the exits anytime soon or, given the tension in the objective, adding to the overall amount of qe2. >> susie: and the nasdaq could be making a bid for its arch rival, the new york stock exchange. reports say the nasdaq omx group has lined up $5 bill